JP2003294554A - Method for correcting lateral force measured value - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for correcting a lateral force measured value. <P>SOLUTION: In this method for correcting the lateral force measured value, the lateral force measured value is detected at an upper fixed part and a lower fixed part of a vertical rotation axis of a load wheel in vehicle tire inspection equipment by using a measuring device of a lateral force and a radial direction force in order to determine a cone effect of a vehicle tire. The method is characterized as follows: a force is applied eccentrically at least once to the load wheel; the lateral force and the radial direction force working on the upper fixed part and the lower fixed part of the rotation axis of the load wheel are detected on the position where a force on the tangent between the vehicle tire and the load wheel or on the periphery thereof is introduced and on the opposite position of the rotation axis of the load wheel; the magnitude of correction is acquired from the difference between the detected upper lateral force and radial direction force and the lower lateral force and radial direction force; and the lateral force measured value is corrected dependently on the radial direction force measured value in the subsequent tire inspection by using the magnitude of the correction. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

The invention relates to a method according to the preamble of claim 1 for correcting lateral force measurements.

[0002]

2. Description of the Related Art Vehicle tires comply with a minimum tolerance, and in the case of a vehicle tire complying with this minimum tolerance, in addition, in order to be able to comply with a class of quality, after manufacture,
Take numerous tests. One of these tests is to determine the cone effect. The cone effect appears when the vehicle tire is manufactured in a cone shape or has a non-uniform spring constant. This cone effect exerts a lateral force between the traveling vehicle tire and the surface of the road.

In a vehicle tire inspection facility, the surface of the road is simulated by load wheels (Lastrad). The rotated vehicle tire is pressed against the outer surface of the loaded wheel. The lateral force is a measuring device (Messaufnehm) which is arranged at a fixed position on the axle of the loaded wheel.
er) can be calculated.

The cone effect is determined by determining the average value of the right-handed lateral force and the average value of the left-handed lateral force of the vehicle tire, and dividing the sum of both lateral forces by two. This measurement usually involves two possible orientation adjustments (Aus
direction adjustment, the direction adjustment refers to an upward or downward display including characteristic data of the vehicle tire called DOT.

After the vehicle tire has rotated, that is, if the display was previously up, after the display was down,
Or vice versa, and after repeated measurements
Although different cone effects were calculated, it was revealed here that they have the same numerical value but the opposite sign.

It has been further confirmed that different values of the cone effect are calculated when the vehicle tire is moved laterally and brought into contact at another location on the outer surface of the load wheel.

The calculated deviations are those produced by the vehicle tire inspection equipment itself, in order to allow the reproducibility of the measurements and the comparison of different tires and tires inspected in different inspection equipments. , This deviation needs to be corrected.

[0008]

The invention is based on the object of presenting a method for correcting lateral force measurements. This method allows reliable corrections without mechanical fine-tuning, independent of the position of contact of the vehicle tires on the loaded wheels.

[0009]

The method according to the invention is a method for modifying a lateral force measurement, which lateral force measurement is used to determine the cone effect of a vehicle tire (26). And radial force measuring devices (18, 20, 22, 2
4) is used to load wheels of vehicle tire inspection equipment (10)
Of the vertical axis of rotation (12) of the vehicle, as detected by the upper fixed part (15) and the lower fixed part (16) of the load wheel (10) at least once eccentrically. , Lateral and radial forces acting on the upper fixed part (14) and the lower fixed part (16) of the rotating shaft (12) of the load wheel (10) are applied to the vehicle tire (26) and the load wheel. The lateral force and radius of the upper portion detected at a position where a force is introduced on or near a tangent to (10) and a position where the rotation shaft (12) of the load wheel (10) faces each other. The magnitude of the correction is obtained from the difference between the directional force and the lateral and radial forces of the lower part, and the magnitude of the correction is used to depend on the radial force measurement in the subsequent tire inspection. Characterized in that the force measurements are modified, whereby Serial object is achieved.

In the first step, the amount of crosstalk of the radial force on the measuring device of the lateral force is given by

[0011]

[Equation 3] Is calculated by, where, Rad1 'the amount _{Lat1, Vorne} the top of the crosstalk, the lateral force _{Lat1, Hinten} top when a force is introduced from the front, the upper part of the case where the force is introduced from the rear Lateral force Lat2, _vorne is the lower lateral force Lat2, _hinten when the force is introduced from the front, and lower lateral force Rad1, _vorne is the lower lateral force when the force is introduced from the rear. radial force _{Rad1, Hinten} the top of the case were the radial force _{RAD2, Vorne} top of the case where the force is introduced from behind, the radial force of the lower when a force is introduced from the front _{Rad2, hinten} the , radial force S ₁ at the bottom of the case where the force is introduced from behind, and that means scale factor, in the second step, a predetermined negative Corn error of vehicle tire in the case of the formula

[0012]

[Equation 4] Where K is the equipment dependent cone error CONY _DOT , the cone effect _{CONY NDOT} when DOT _{points up} , and the cone effect LOAD _DOT when DOT points down. The radial load LOAD _NDOT by the vehicle in the case of the fact that the radial load S ₂ by the vehicle in the case of the DOT _lowering means the scale factor, and the amount of crosstalk in the third step. rad ₁ 'and complete correction value from corn error _{K rad 1 = rad 1' +} K / 2 and _rad 2 = -Ra
It may be characterized in that d ₁ ′ + K / 2 is calculated and the lateral force measurements of the upper measuring device and the lower measuring device are corrected using the correction value.

The crosstalk of the radial forces on the measuring device of the lateral forces may be characterized in that they are calculated at predetermined time intervals and / or after maintenance and refitting measures.

The measured values of the radial and lateral force measuring devices are detected and processed at fixed parts above and below the axis of rotation of the load wheel and only after the lateral forces have been summed up are corrected. It may be characterized by being performed.

In the case of the method according to the preamble of claim 1, this problem is solved by the features of this claim.

The improvements and advantageous embodiments of the invention are:
It is clear from the dependent claims.

[0017]

DETAILED DESCRIPTION OF THE INVENTION The measurement according to the invention recognizes that the lateral force calculated by the measuring device is inaccurate by the radial force, which is a non-ideal component of the force in the measuring device. Based on the recognition that there may be a difference between the upper measuring device and the lower measuring device. This phenomenon is also called crosstalk.

This effect can be calculated by predetermining the different effects of the measuring device at the fixed positions of the lower and upper parts of the rotating shaft of the load wheel. This means that the tilting moments act in two opposite directions, in the direction of the active radial load, on the axis of the load wheel, whereby the crosstalk to the lateral force measuring device is determined. The tilting moment is exerted by exerting an eccentric axial force on the loaded wheel, for example by applying a weight, after which two measurements are made. In the first measurement, the force in the vicinity of the tangent to the vehicle tire acts on the front side from the side observed by the operator, and the force on the surface on the opposite side in the second measurement acts on the rear side from the side observed by the operator. is there.

From the difference between the two measurements, a correction value is then calculated, which correction value is used to correct the measured lateral force in future measurements. The corrected lateral force measurements were then used to calculate cone effect results, which were reproducible and comparable, from which the effects of tire inspection equipment were removed.

In making a complete correction, several steps are performed. In the first step, the amount of radial force crosstalk to the lateral force measuring device is determined by the following equation.

[0021]

[Equation 5] Here, Rad1 ′ is the amount of upper crosstalk Lat1, _vorne , upper lateral force Lat1 when force is introduced from the front Lat1, _hinten is upper lateral force Lat2 when force is introduced from the rear. , _Vorne is the lower lateral force when the force is introduced from the front Lat2, _hinten , and the lower lateral force when the force is introduced from the rear Rad1, _vorne is the upper part when the force is introduced from the front _Radial force Rad1, _hinten is the upper radial force Rad2, _vorne when the force is introduced from the rear, and lower radial force Rad2, _hinten is the force when the force is introduced from the front. The lower radial force S ₁ when introduced from means the scale factor.

In the second step, a vehicle tire cone error (Konusfehler) under a predetermined load
Is calculated by the following formula.

[0023]

[Equation 6] Here, K is an equipment-dependent cone error CONY _DOT , a cone effect _{CONY NDOT} when DOT _{points up} , a cone effect LOAD _DOT when DOT _points down, and a cone effect LOAD _DOT when DOT points up, Vehicle radial load LOAD _NDOT is the radial load S ₂ of the vehicle when the DOT _points down, is a scale factor.

In the third step, the amount of crosstalk R
Ad ₁ 'and cone error K from Rad completely corrected value Rad
₁ = Rad ₁ '+ K / 2 and Rad ₂ = -Rad ₁ '
+ K / 2 is required. These values are used to modify the lateral force measurements of the upper and lower measuring devices. This is done by the general formula Lat = Lat ′ ₁ + Lat ′ ₂ where Lat ′ _x = Lat _x + Rad _x ′ ^* Rad _x .

Where Lat ' _x is the modified measured value Lat _x , lateral force device measured value Rad' _x is the lateral radial crosstalk amount Rad _x is the lateral force device measured value. The value Lat means the resulting lateral force.

The final equation is: Lat = Lat ₁ −Rat ₁ ′ ^* Rad ₁ / S ₁ + La
^{_{t 2 -Rad 2 '* Rad 2}} / S 1 Lat = Lat 1 + Lat 2 - (Rad 1' * Rad 1
+ Rad ₂ ' ^* Rad ₂ ') / S ₁ The result of the first step provides a measure of the difference between the upper and lower measuring devices. This value does not depend on the radial force on the loaded wheels and is therefore taken over by the scale of the connected calculator and can be used for further measurements when inspecting vehicle tires.

In the second step, due to the cone effect and the load of the vehicle tire pushing the load wheel, there is a cone error from the cone effect, which is equipment dependent, as the indication points up and down in relation to the load. It is calculated.

The sum of crosstalk and cone error calculated in the third step reveals a correction value, corrects the measured lateral force and eliminates the equipment-dependent cone error. If these corrections are then used instead of the lateral force measurements, whether the vehicle tires have been measured using the upper or lower display, or the vehicle tires are the outer surface of the loaded vehicle. The value of the cone effect is the same no matter where in the above location it rotates.

As a result of the refinement, the radial force crosstalk to the lateral force measuring device is newly calculated at fixed time intervals and / or in response to maintenance and refitting work.

With the passage of time or during maintenance and refitting operations, it is possible to slightly change the fixing of the axles of the load wheels, or even the orientation of the measuring sensor, so that Crosstalk behavior is changed. By being calculated again, such changes can be eliminated and the test equipment can be guaranteed to always produce reproducible results.

Furthermore, the measured values of the radial force and lateral force measuring devices are detected and processed separately at fixed parts above and below the axis of rotation of the load wheel, and after correction only the lateral forces are summed.

Based on this separate processing, the effect of crosstalk on the individual measuring devices can be selected and the required correction values can be obtained.

In the following, the invention will be explained with reference to the figures and the measurement examples.

FIG. 1 is a schematic diagram showing a tire inspection facility having load wheels 10 whose upper and lower sides are fixed on a rotating shaft 12. At the upper fixed position 14 and the lower fixed position 16, the measuring device, that is, the measuring device for lateral force 1
8, a measuring device 20 for the radial force in the direction of the load exerted through the vehicle tire to be inspected, as well as at the lower fixed position 16, a measuring device 22 for the lateral force and a radial force. A measuring device 24 is located.

The measuring devices 18, 20, 22, 24 are preferably extensometers (Dehnungsmessbrück).
en) and the signal line reaches the computer 34.
In this calculator 34, the measuring devices 18, 20, 22,
Twenty four signals are evaluated and modified.

Located parallel to the axis of the load wheel 10 is a vehicle tire 26 to be inspected, which is fixed to the rim arrangement of the wheel and can be rotated by the drive through the rim arrangement of the wheel. To be The vehicle tire 26 can now be pressed against the wheel 10 by a load which corresponds approximately to the load exerted in a later driving operation.

In the first step, in order to calculate the amount of crosstalk, the weight 32 is eccentrically placed above the loaded wheel 1.
Mounted on the zero, first, static measurements are calculated with the vehicle tire to be inspected, without load. If the loaded wheel 10 with the weight 32 is located in the vicinity of the tangent of the loaded wheel 10 to the vehicle tire 26 to be inspected during tire inspection, the first series of measured values is calculated. At this time, the weight 32 is located on the straight line connecting the shaft 12 of the load wheel 10 and the tangent line. After that, the load wheel 10 is
Being rotated 80 °, the weight 32 is aligned in the opposite position. After that, a series of measurement values is calculated again.

In one measurement example, a weight with a force of 100 N was used. At the previous position, ie near the tangent, the following value Rad ₁ = −6477, L
at ₁ = −101168, Rad ₂ = + 8218, La
t ₂ = + 28398 is measured.

At the rear, ie at the opposite position, the following values Rad ₁ = + 7020, Lat ₁ = -10.
_{1816, Rad 2 = -5284, Lat} 2 = + 290
55 is calculated.

[0040]

[Equation 7] When the scale factor S ₁ = 40000, the crosstalk amount 25 of Rad ₁ and the crosstalk amount -25 of Rad ₂ are calculated. These values are
Stored for the next tire inspection.

In the following measurements on tires, negative
When the load is 4000N, the cone effect is higher with DOT30.
When it is located at 50, it is -64 when DOT30 is located at the bottom.
Was measured. Substituting into the cone error equation, the scale
Factor S_Two= 160,000, the value of -280 is
Desired. After considering the amount of crosstalk, Rad ₁
Has a cone error of -255, and Rad_TwoCornie
Ra is corrected by -305.

Now, if the measured value of the lateral force is corrected by the full correction value according to the equation applied in the third step, the two measurements of the cone effect are DOT _oben.
And DOT _unten the same result, in this case,
57 and -57.

A method of correcting lateral force measurements is described.
This lateral force measurement is used to determine the cone effect of a vehicle tire using a lateral and radial force measuring device to determine the upper and lower fixed parts of the vertical axis of rotation of the load wheel of a vehicle tire inspection facility. Detected at.

In this case, at least once on the loaded wheels,
Eccentrically applied force, lateral force and radial force acting on the upper and lower fixed positions of the rotation axis of the load wheel, on the tangent line between the vehicle tire and the load wheel, or in the vicinity thereof, a position for introducing the force, Also, it is detected at a position where the rotating shafts of the load wheels face each other. The magnitude of the correction is obtained from the difference between the detected upper lateral force and radial force and the lower lateral force and radial force, and this corrected magnitude is used to measure the radial force in the subsequent tire inspection. The lateral force measurement is modified depending on the value.

[0045]

According to the present invention, a method for correcting the lateral force measurement value can be presented. This method allows reliable corrections without mechanical fine-tuning, independent of the position of contact of the vehicle tires on the loaded wheels.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a tire inspection facility having load wheels 10 whose upper and lower sides are fixed on a rotating shaft 12.

[Explanation of symbols]

10 load wheels 12 Vertical rotation axis 14 Upper fixed part 16 Lower fixed part 18 Measuring device for lateral force 20 Radial force measuring device 22 Measuring device for lateral force 24 Radial force measuring device 26 vehicle tires 30 DOT 32 weight 34 calculator

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Michael Mainen             Germany Day 31171 Nordsteme             Rosenstraße 7 F term (reference) 2F051 AA01 AC03 BA00

Claims (4)

[Claims] 1. A method for modifying a lateral force measurement, said lateral force measurement comprising a lateral force and radial force measuring device (18) for determining the cone effect of a vehicle tire (26).
20, 22, 24) is detected at the upper fixed part (15) and the lower fixed part (16) of the vertical rotation shaft (12) of the load wheel (10) of the vehicle tire inspection facility,
A method comprising eccentrically applying a force to the load wheel (10) at least once, the upper fixed part (14) and the lower fixed part of the rotating shaft (12) of the load wheel (10). Lateral and radial forces acting on (16) are applied to vehicle tires (26).
On the tangent line between the load wheel (10) and the load wheel (10) or at a position where the force is introduced, and at a position where the rotary shaft (12) of the load wheel (10) faces each other. The magnitude of the modification is obtained from the difference between the lateral and radial forces and the lower lateral and radial forces, and the magnitude of the modification is used to depend on the radial force measurements in the subsequent tire inspection. And the lateral force measurement is modified. 2. In the first step, the amount of crosstalk of radial force on the measuring device of lateral force is given by the equation: Is calculated by, where, Rad1 'the amount _{Lat1, Vorne} the top of the crosstalk, the lateral force _{Lat1, Hinten} top when a force is introduced from the front, the upper part of the case where the force is introduced from the rear Lateral force Lat2, _vorne is the lower lateral force Lat2, _hinten when the force is introduced from the front, and lower lateral force Rad1, _vorne is the lower lateral force when the force is introduced from the rear. radial force _{Rad1, Hinten} the top of the case were the radial force _{RAD2, Vorne} top of the case where the force is introduced from behind, the radial force of the lower when a force is introduced from the front _{Rad2, hinten} the , radial force S ₁ at the bottom of the case where the force is introduced from behind, and that means scale factor, in the second step, a predetermined negative Corn error of vehicle tire in the case of the formula ## EQU2 ## Where K is the equipment dependent cone error CONY _DOT , the cone effect _{CONY NDOT} when DOT _{points up} , and the cone effect LOAD _DOT when DOT points down. The radial load LOAD _NDOT by the vehicle in the case of the fact that the radial load S ₂ by the vehicle in the case of the DOT _lowering means the scale factor, and the amount of crosstalk in the third step. From Rad ₁ 'and cone error K a complete correction value Rad ₁ = Ra
d ₁ '+ K / 2 and _{Rad 2 = -Rad 1' + K} / 2
The method according to claim 1, characterized in that the lateral force measurements of the upper measuring device and the lower measuring device are corrected using the correction value. 3. Crosstalk of radial forces on the measuring device of lateral forces is calculated at predetermined time intervals and / or after maintenance and refitting measures. The method of claim 2. 4. The lateral force only after the measured values of the radial and lateral force measuring device have been detected and processed and fixed in the upper and lower fixed parts of the rotating shaft of the load wheel. The method according to one of claims 1 to 3, characterized in that